Apple Watch 4 – specs, features and improvements

Apple powers the watch with a new processor too – a chipset dubbed Apple S4, with a dual-core 64-bit CPU that should deliver "two times faster performance", according to Williams.

It comes with a new and improved speaker (louder) and microphone (more accurate) system, and brand new WatchOS5 software to boot.

One of the headline features is the watch's ability to can detect when you've fallen over, and can deliver an alert that lets you initiate an emergency call.

If the watch senses that you're immobile for more than a minute, it will start the call automatically, and contact the emergency contact in your phone, too.

That's not the only health feature, however.

The Apple Watch Series 4 can also screen your heart rhythm for irregularities, alerting you about any issues.

It has the ability to let you take an electrocardiogram (ECG) in just 30 seconds – letting you check the electrical signals your heart produces, tracking its rhythm. You can then share this data with your doctor.

Apple Event 2018: Apple Watch Series 4 enables users to take an electrocardiogram or ECG in 30 seconds

The Digital Crown, which is the twistable knob on the side of the watch, has also been improved.

It now includes haptic feedback, which means you'll feel a small response when you touch it – making the button feel more alive.

Apple promises an 18-hour battery life, which is the same as last year's model. That's impressive, given the screen size bump for the 2018 version.

"The new Apple watch is much bigger than its predecessors which we think will be a huge hit with our customers, who will be able to see more content on the screen than ever before," said Phil Elford, Head of Technology, at Argos.